Special handling of priv-apps in PMS.

If pm.dexopt.priv-apps is set to false, don't do any dexopt on it, and
check the APKs have uncompressed and aligned code.

bug: 30972906
bug: 63920015

Test: works as expected when pm.dexopt.priv-apps is true or false
Change-Id: I72a322defb459549617028e030f1aec997223af5